body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "微软雅黑", sans-serif;
}
#app {
  width: 100vw;
  height: 100vh;
  background: url('lv-bg.jpg') no-repeat center center/cover;
  position: relative;
  overflow: hidden;
}
.page {
  width: 100vw;
  height: 100vh;
  position: absolute;
  top: 0; left: 0;
  display: none;
  transition: transform 0.5s;
}
.page.active {
  display: block;
}
#startBtn {
  position: absolute;
  bottom: 20%;
  left: 50%;
  transform: translateX(-50%);
  padding: 16px 32px;
  font-size: 20px;
  border-radius: 8px;
  border: none;
  background: rgba(255,255,255,0.8);
  cursor: pointer;
}
.timeline {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 4px;
  height: 0;
  background: gold;
  transform: translateX(-50%);
  transition: height 1s;
  z-index: 2;
}
.timeline.show {
  height: 60vh;
}
.year-node {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 40px;
  background: #fff8e1;
  border-radius: 50%;
  border: 2px solid gold;
  text-align: center;
  line-height: 40px;
  font-weight: bold;
  color: #bfa14a;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.5s;
}
.year-node.show {
  opacity: 1;
}
.page-detail {
  background: rgba(0,0,0,0.7);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10;
  transform: translateY(100%);
}
.page-detail.active {
  display: flex;
  transform: translateY(0);
  transition: transform 0.5s;
}
.detail-content {
  font-size: 22px;
  margin-bottom: 30px;
  max-width: 80vw;
  text-align: center;
} 